Alc/winmm.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <memory.h>
  26
  27 #include <windows.h>
  28 #include <mmsystem.h>
  29
  30 #include "alMain.h"
  31 #include "AL/al.h"
  32 #include "AL/alc.h"
  33
  34
  35 typedef struct {
  36     // MMSYSTEM Capture Device
  37     ALboolean        bWaveInShutdown;
  38     HANDLE           hWaveInHdrEvent;
  39     HANDLE           hWaveInThreadEvent;
  40     HANDLE           hWaveInThread;
  41     DWORD            ulWaveInThreadID;
  42     ALint            lWaveInBuffersCommitted;
  43     HWAVEIN          hWaveInHandle;
  44     WAVEHDR          WaveInBuffer[4];
  45     ALCchar          *pCapturedSampleData;
  46     ALuint           ulCapturedDataSize;
  47     ALuint           ulReadCapturedDataPos;
  48     ALuint           ulWriteCapturedDataPos;
  49 } WinMMData;
  50
  51
  52 static ALCchar *CaptureDeviceList[16];
  53
  54 /*
  55     WaveInProc
  56
  57     Posts a message to 'CaptureThreadProc' everytime a WaveIn Buffer is completed and
  58     returns to the application (with more data)
  59 */
  60 static void CALLBACK WaveInProc(HWAVEIN hDevice,UINT uMsg,DWORD_PTR dwInstance,DWORD_PTR dwParam1,DWORD_PTR dwParam2)
  61 {
  62     ALCdevice *pDevice = (ALCdevice *)dwInstance;
  63     WinMMData *pData = pDevice->ExtraData;
  64
  65     (void)hDevice;
  66     (void)dwParam2;
  67
  68     if ((uMsg==WIM_DATA) && (pDevice))
  69     {
  70         // Decrement number of buffers in use
  71         pData->lWaveInBuffersCommitted--;
  72
  73         if (pData->bWaveInShutdown == AL_FALSE)
  74         {
  75             // Notify Wave Processor Thread that a Wave Header has returned
  76             PostThreadMessage(pData->ulWaveInThreadID,uMsg,0,dwParam1);
  77         }
  78         else
  79         {
  80             if (pData->lWaveInBuffersCommitted == 0)
  81             {
  82                 // Signal Wave Buffers Returned event
  83                 if (pData->hWaveInHdrEvent)
  84                     SetEvent(pData->hWaveInHdrEvent);
  85
  86                 // Post 'Quit' Message to WaveIn Processor Thread
  87                 PostThreadMessage(pData->ulWaveInThreadID,WM_QUIT,0,0);
  88             }
  89         }
  90     }
  91 }
  92
  93 /*
  94     CaptureThreadProc
  95
  96     Used by "MMSYSTEM" Device.  Called when a WaveIn buffer had been filled with new
  97     audio data.
  98 */
  99 DWORD WINAPI CaptureThreadProc(LPVOID lpParameter)
 100 {
 101     ALCdevice *pDevice = (ALCdevice*)lpParameter;
 102     WinMMData *pData = pDevice->ExtraData;
 103     ALuint ulOffset, ulMaxSize, ulSection;
 104     LPWAVEHDR pWaveHdr;
 105     MSG msg;
 106
 107     while (GetMessage(&msg, NULL, 0, 0))
 108     {
 109         if ((msg.message==WIM_DATA)&&(!pData->bWaveInShutdown))
 110         {
 111             SuspendContext(NULL);
 112
 113             pWaveHdr = ((LPWAVEHDR)msg.lParam);
 114
 115             // Calculate offset in local buffer to write data to
 116             ulOffset = pData->ulWriteCapturedDataPos % pData->ulCapturedDataSize;
 117
 118             if ((ulOffset + pWaveHdr->dwBytesRecorded) > pData->ulCapturedDataSize)
 119             {
 120                 ulSection = pData->ulCapturedDataSize - ulOffset;
 121                 memcpy(pData->pCapturedSampleData + ulOffset, pWaveHdr->lpData, ulSection);
 122                 memcpy(pData->pCapturedSampleData, pWaveHdr->lpData + ulSection, pWaveHdr->dwBytesRecorded - ulSection);
 123             }
 124             else
 125             {
 126                 memcpy(pData->pCapturedSampleData + ulOffset, pWaveHdr->lpData, pWaveHdr->dwBytesRecorded);
 127             }
 128
 129             pData->ulWriteCapturedDataPos += pWaveHdr->dwBytesRecorded;
 130
 131             if (pData->ulWriteCapturedDataPos > (pData->ulReadCapturedDataPos + pData->ulCapturedDataSize))
 132             {
 133                 // Application has not read enough audio data from the capture buffer so data has been
 134                 // overwritten.  Reset ReadPosition.
 135                 pData->ulReadCapturedDataPos = pData->ulWriteCapturedDataPos - pData->ulCapturedDataSize;
 136             }
 137
 138             // To prevent an over-flow prevent the offset values from getting too large
 139             ulMaxSize = pData->ulCapturedDataSize << 4;
 140             if ((pData->ulReadCapturedDataPos > ulMaxSize) && (pData->ulWriteCapturedDataPos > ulMaxSize))
 141             {
 142                 pData->ulReadCapturedDataPos -= ulMaxSize;
 143                 pData->ulWriteCapturedDataPos -= ulMaxSize;
 144             }
 145
 146             // Send buffer back to capture more data
 147             waveInAddBuffer(pData->hWaveInHandle,pWaveHdr,sizeof(WAVEHDR));
 148             pData->lWaveInBuffersCommitted++;
 149
 150             ProcessContext(NULL);
 151         }
 152     }
 153
 154     // Signal Wave Thread completed event
 155     if (pData->hWaveInThreadEvent)
 156         SetEvent(pData->hWaveInThreadEvent);
 157
 158     ExitThread(0);
 159
 160     return 0;
 161 }
 162
 163
 164 static ALCboolean WinMMOpenPlayback(ALCdevice *device, const ALCchar *deviceName)
 165 {
 166     (void)device;
 167     (void)deviceName;
 168     return ALC_FALSE;
 169 }
 170
 171 static void WinMMClosePlayback(ALCdevice *device)
 172 {
 173     (void)device;
 174 }
 175
 176
 177 static ALCboolean WinMMOpenCapture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 178 {
 179     WAVEFORMATEX wfexCaptureFormat;
 180     WinMMData *pData = NULL;
 181     ALint lDeviceID = 0;
 182     ALint lBufferSize;
 183     ALint i;
 184
 185     (void)format;
 186
 187     // Find the Device ID matching the deviceName if valid
 188     if (deviceName)
 189     {
 190         for(i = 0;CaptureDeviceList[i];i++)
 191         {
 192             if (!strcmp(deviceName, CaptureDeviceList[i]))
 193             {
 194                 lDeviceID = i;
 195                 break;
 196             }
 197         }
 198         if(!CaptureDeviceList[i])
 199             return ALC_FALSE;
 200     }
 201     pDevice->szDeviceName = CaptureDeviceList[lDeviceID];
 202
 203     pData = calloc(1, sizeof(*pData));
 204     if(!pData)
 205     {
 206         SetALCError(ALC_OUT_OF_MEMORY);
 207         return ALC_FALSE;
 208     }
 209
 210     memset(&wfexCaptureFormat, 0, sizeof(WAVEFORMATEX));
 211     wfexCaptureFormat.wFormatTag = WAVE_FORMAT_PCM;
 212     wfexCaptureFormat.nChannels = pDevice->Channels;
 213     wfexCaptureFormat.wBitsPerSample = pDevice->FrameSize / pDevice->Channels * 8;
 214     wfexCaptureFormat.nBlockAlign = pDevice->FrameSize;
 215     wfexCaptureFormat.nSamplesPerSec = frequency;
 216     wfexCaptureFormat.nAvgBytesPerSec = wfexCaptureFormat.nSamplesPerSec *
 217                                         pDevice->FrameSize;
 218     wfexCaptureFormat.cbSize = 0;
 219
 220     if (waveInOpen(&pData->hWaveInHandle, lDeviceID, &wfexCaptureFormat, (DWORD_PTR)&WaveInProc, (DWORD_PTR)pDevice, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
 221         goto failure;
 222
 223     pData->hWaveInHdrEvent = CreateEvent(NULL, AL_TRUE, AL_FALSE, "WaveInAllHeadersReturned");
 224     if (pData->hWaveInHdrEvent == NULL)
 225         goto failure;
 226
 227     pData->hWaveInThreadEvent = CreateEvent(NULL, AL_TRUE, AL_FALSE, "WaveInThreadDestroyed");
 228     if (pData->hWaveInThreadEvent == NULL)
 229         goto failure;
 230
 231     pData->hWaveInThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)CaptureThreadProc, (LPVOID)pDevice, 0, &pData->ulWaveInThreadID);
 232     if (pData->hWaveInThread == NULL)
 233         goto failure;
 234
 235     // Allocate circular memory buffer for the captured audio
 236     pData->ulCapturedDataSize = SampleSize * wfexCaptureFormat.nBlockAlign;
 237
 238     // Make sure circular buffer is at least 100ms in size (and an exact multiple of
 239     // the block alignment
 240     if (pData->ulCapturedDataSize < (wfexCaptureFormat.nAvgBytesPerSec / 10))
 241     {
 242         pData->ulCapturedDataSize = wfexCaptureFormat.nAvgBytesPerSec / 10;
 243         pData->ulCapturedDataSize -= (pData->ulCapturedDataSize % wfexCaptureFormat.nBlockAlign);
 244     }
 245
 246     pData->pCapturedSampleData = (ALCchar*)malloc(pData->ulCapturedDataSize);
 247     pData->lWaveInBuffersCommitted=0;
 248
 249     // Create 4 Buffers of 50ms each
 250     lBufferSize = wfexCaptureFormat.nAvgBytesPerSec / 20;
 251     lBufferSize -= (lBufferSize % wfexCaptureFormat.nBlockAlign);
 252
 253     for (i=0;i<4;i++)
 254     {
 255         memset(&pData->WaveInBuffer[i], 0, sizeof(WAVEHDR));
 256         pData->WaveInBuffer[i].dwBufferLength = lBufferSize;
 257         pData->WaveInBuffer[i].lpData = calloc(1,pData->WaveInBuffer[i].dwBufferLength);
 258         pData->WaveInBuffer[i].dwFlags = 0;
 259         pData->WaveInBuffer[i].dwLoops = 0;
 260         waveInPrepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 261         waveInAddBuffer(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 262         pData->lWaveInBuffersCommitted++;
 263     }
 264
 265     pData->ulReadCapturedDataPos = 0;
 266     pData->ulWriteCapturedDataPos = 0;
 267
 268     pDevice->ExtraData = pData;
 269     return ALC_TRUE;
 270
 271 failure:
 272     if (pData->hWaveInThreadEvent)
 273         CloseHandle(pData->hWaveInThreadEvent);
 274     if (pData->hWaveInHdrEvent)
 275         CloseHandle(pData->hWaveInHdrEvent);
 276     if (pData->hWaveInHandle)
 277         waveInClose(pData->hWaveInHandle);
 278
 279     free(pData);
 280     return ALC_FALSE;
 281 }
 282
 283 static void WinMMCloseCapture(ALCdevice *pDevice)
 284 {
 285     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 286     int i;
 287
 288     // Call waveOutReset to shutdown wave device
 289     pData->bWaveInShutdown = AL_TRUE;
 290     waveInReset(pData->hWaveInHandle);
 291
 292     // Wait for signal that all Wave Buffers have returned
 293     WaitForSingleObjectEx(pData->hWaveInHdrEvent, 5000, FALSE);
 294
 295     // Wait for signal that Wave Thread has been destroyed
 296     WaitForSingleObjectEx(pData->hWaveInThreadEvent, 5000, FALSE);
 297
 298     // Release the wave buffers
 299     for (i=0;i<4;i++)
 300     {
 301         waveInUnprepareHeader(pData->hWaveInHandle, &pData->WaveInBuffer[i], sizeof(WAVEHDR));
 302         free(pData->WaveInBuffer[i].lpData);
 303     }
 304
 305     // Free Audio Buffer data
 306     free(pData->pCapturedSampleData);
 307     pData->pCapturedSampleData = NULL;
 308
 309     // Close the Wave device
 310     waveInClose(pData->hWaveInHandle);
 311     pData->hWaveInHandle = 0;
 312
 313     CloseHandle(pData->hWaveInThread);
 314     pData->hWaveInThread = 0;
 315
 316     if (pData->hWaveInHdrEvent)
 317     {
 318         CloseHandle(pData->hWaveInHdrEvent);
 319         pData->hWaveInHdrEvent = 0;
 320     }
 321
 322     if (pData->hWaveInThreadEvent)
 323     {
 324         CloseHandle(pData->hWaveInThreadEvent);
 325         pData->hWaveInThreadEvent = 0;
 326     }
 327
 328     free(pData);
 329     pDevice->ExtraData = NULL;
 330 }
 331
 332 static void WinMMStartCapture(ALCdevice *pDevice)
 333 {
 334     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 335     waveInStart(pData->hWaveInHandle);
 336 }
 337
 338 static void WinMMStopCapture(ALCdevice *pDevice)
 339 {
 340     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 341     waveInStop(pData->hWaveInHandle);
 342 }
 343
 344 static void WinMMCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 345 {
 346     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 347     ALuint ulSamples = (unsigned long)lSamples;
 348     ALuint ulBytes, ulBytesToCopy;
 349     ALuint ulCapturedSamples;
 350     ALuint ulReadOffset;
 351
 352     // Check that we have the requested numbers of Samples
 353     ulCapturedSamples = (pData->ulWriteCapturedDataPos - pData->ulReadCapturedDataPos) / pDevice->FrameSize;
 354     if(ulSamples > ulCapturedSamples)
 355     {
 356         SetALCError(ALC_INVALID_VALUE);
 357         return;
 358     }
 359
 360     ulBytes = ulSamples * pDevice->FrameSize;
 361
 362     // Get Read Offset
 363     ulReadOffset = (pData->ulReadCapturedDataPos % pData->ulCapturedDataSize);
 364
 365     // Check for wrap-around condition
 366     if ((ulReadOffset + ulBytes) > pData->ulCapturedDataSize)
 367     {
 368         // Copy data from last Read position to end of data
 369         ulBytesToCopy = pData->ulCapturedDataSize - ulReadOffset;
 370         memcpy(pBuffer, pData->pCapturedSampleData + ulReadOffset, ulBytesToCopy);
 371
 372         // Copy rest of the data from the start of the captured data
 373         memcpy(((char *)pBuffer) + ulBytesToCopy, pData->pCapturedSampleData, ulBytes - ulBytesToCopy);
 374     }
 375     else
 376     {
 377         // Copy data from the read position in the captured data
 378         memcpy(pBuffer, pData->pCapturedSampleData + ulReadOffset, ulBytes);
 379     }
 380
 381     // Update Read Position
 382     pData->ulReadCapturedDataPos += ulBytes;
 383 }
 384
 385 static ALCuint WinMMAvailableSamples(ALCdevice *pDevice)
 386 {
 387     WinMMData *pData = (WinMMData*)pDevice->ExtraData;
 388     ALCuint lCapturedBytes = (pData->ulWriteCapturedDataPos - pData->ulReadCapturedDataPos);
 389     return lCapturedBytes / pDevice->FrameSize;
 390 }
 391
 392
 393 BackendFuncs WinMMFuncs = {
 394     WinMMOpenPlayback,
 395     WinMMClosePlayback,
 396     WinMMOpenCapture,
 397     WinMMCloseCapture,
 398     WinMMStartCapture,
 399     WinMMStopCapture,
 400     WinMMCaptureSamples,
 401     WinMMAvailableSamples
 402 };
 403
 404 void alcWinMMInit(BackendFuncs *FuncList)
 405 {
 406     ALint lNumDevs;
 407     ALint lLoop;
 408
 409     *FuncList = WinMMFuncs;
 410
 411     lNumDevs = waveInGetNumDevs();
 412     for (lLoop = 0; lLoop < lNumDevs; lLoop++)
 413     {
 414         WAVEINCAPS WaveInCaps;
 415         if(waveInGetDevCaps(lLoop, &WaveInCaps, sizeof(WAVEINCAPS)) == MMSYSERR_NOERROR)
 416         {
 417             char name[128];
 418             snprintf(name, sizeof(name), "WaveIn on %s", WaveInCaps.szPname);
 419             CaptureDeviceList[lLoop] = AppendCaptureDeviceList(name);
 420         }
 421     }
 422 }